bonjour
BDE est rectangle en D
DE² = 7.5 ² - 4.5 ²
dE² = 36
DE = √36 = 6 cm
BD/BA = BE/BC = DE/AC
4.5/10.8 = 6/ AC
⇔ AC =14.4 cm
BC² = 10.8² + 14.4² = 324
BC = √324 = 18 cm
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bonjour
BDE est rectangle en D
DE² = 7.5 ² - 4.5 ²
dE² = 36
DE = √36 = 6 cm
BD/BA = BE/BC = DE/AC
4.5/10.8 = 6/ AC
⇔ AC =14.4 cm
BC² = 10.8² + 14.4² = 324
BC = √324 = 18 cm